More importantly could you add a column to show geographic restrictions? For people in Austalia and New Zealand geographic restriction is more of a problem than DRM. After all, one can remove DRM.

Unfortunately no. Most stores do not disclose this information. The only way to know if they do not sell to your location is to try buying from them and hope it works. This is something that if we don't get it right will have a very negative affect on users.

I've spotted a weird problem (move this to the appropriate bug thread if there is one).

If I search for "Clarkesworld", lots of issues come up including Clarkesworld 54 at Wizard's Tower. But if I search "Clarkesworld 54", I get results from Weightless Books, B&N and various Amazons, but not from Wizard's Tower.

I've spotted a weird problem (move this to the appropriate bug thread if there is one).
If I search for "Clarkesworld", lots of issues come up including Clarkesworld 54 at Wizard's Tower. But if I search "Clarkesworld 54", I get results from Weightless Books, B&N and various Amazons, but not from Wizard's Tower.
Weird.